Aiming at the disadvantages of existing powder feeding nozzle, which include powder convergent inferior, powder outlet is easy to block and thermal deformation, designed a four hole coaxial powder feeding nozzle. The center of nozzle is laser beam as well as shielding gas channel and the four holes which along the center bore axially uniform distribution is powder channel. Numerical calculation model is established by using FLUENT software on the powder flow numerical simulation under the condition of the powder feeding channel outlet in different shape and different dip angle, and the optimal scheme is selected. The results show that the contraction of export and the powder channel angle of 70° is beneficial to improve the cladding forming effect with other process parameters invariable. Finally, with the developed powder feeding nozzle for powder together, laser cladding forming test and so on, validates the experimental effect of powder feeding nozzle.